71811 CD/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71811 CD/P4 Bearing Product Overview & Core Advantages
The 71811 CD/P4 is a single-row angular contact ball bearing designed for applications demanding exceptional precision and high-speed performance. Engineered to P4 (ABEC-7) tolerance class, it delivers superior running accuracy and rotational stability. Its key advantage lies in its ability to accommodate combined loads, efficiently handling both radial and substantial axial loads in one direction. The phenolic cage and optimized internal geometry contribute to its high limiting speed of 28,000 rpm, making it an ideal choice for compact, high-rigidity spindle arrangements.
71811 CD/P4 Bearing Model Code Explained, Specifications & Naming Convention
- 71811: Basic designation indicating a metric, single-row angular contact ball bearing with a 55mm bore, 72mm OD, and 9mm width.
- C: Denotes a 15° contact angle, optimized for high-speed applications with moderate axial load capacity.
- D: Indicates the bearing is supplied with a specific preload for enhanced rigidity and precise shaft positioning.
- P4: Specifies the tolerance class equivalent to ABEC-7, ensuring extremely tight dimensional and running accuracy for precision machinery.
71811 CD/P4 Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The P4 tolerance class and application of preload (D) ensure minimal runout and high system stiffness, which is critical for maintaining accuracy under load.
Optimized Load Capacity: The 15° contact angle (C) provides an excellent balance, enabling the bearing to support significant axial loads in addition to radial loads, making it suitable for combined load conditions.
Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal design and lubrication work in concert to achieve the high limiting speed.
Material Integrity: Manufactured from chrome steel for both rings and balls, the bearing offers high fatigue life and durability within its specified temperature range.
71811 CD/P4 Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for applications requiring high speed, rigidity, and accuracy, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Robotic Arm Joints and Drives
